Is there a known record for the most possible stalemates in one in a legal position, for with and without promoted pieces?

I have gotten some results out of my own work.

For without promoted pieces, I've found 95 possible moves, counting different promotions as different moves.

[FEN "kN6/P1PPPPPP/1K6/2R5/8/3B1N2/3B2P1/Q6R w - - 0 1"]

For with promoted pieces, I've found 199 possible moves, at the cost of a couple of immobile units.

[FEN "k1B3R1/NNBQ4/K4Q2/2Q4Q/4Q3/1Q4Q1/3Q4/R4Q2 w - - 0 1"]

If my counts are incorrect, feel free to correct me!

UPDATE: I remembered the position from elsewhere on this site that has the maximum turn movement of 218 moves I switched two pieces, made come count deductions, and I arrived at a number of 205 moves for with promoted pieces.

[FEN "R6B/3Q4/1Q4Q1/4Q3/2Q4Q/Q4Q2/pp1Q4/kBNN1KR1 w - - 0 1"]

I also found a new record of 104 moves for without promoted pieces. I'm not so sure that this can possibly be improved upon.

EDIT: Now it's possible to have 105 with a slight modification of moving a rook to the b-file, which allows for 13 moves instead of 12.

[FEN "kN6/P1PPPPPP/2P5/4K3/6Q1/2NBB3/1R6/R7 w KQkq - 0 1"]
  • Your "with promoted pieces" currently has 9 queens and 3 bishops, so it seems illegal. – D M Jul 15 '19 at 3:25
  • What about stalemate by repetition? If you were to give the black king two squares to move between, you would have a huge number of different combinations that produce a threefold repetition... – Aric Jul 17 '19 at 10:32
  • 3
    @Aric that is called Draw by repitition – Marvin Jul 18 '19 at 18:39
  • 1
    The first position isn't legal, there's no possible previous move for black. The third position is already a draw, since there's no possible sequence of moves that will lead to either player getting mated. – DanTilkin Aug 8 '19 at 22:14

Some new records, pulled from the Dieschwable Chess Problem Database Server.

Without Promoted Pieces: 113 Stalemating Moves, ID# P0005616, Created By Anthony Stewart & Mackay Dickens, Published In FEENSCHACH, Date 09/1969

[FEN "6R1/PPPPPP2/7R/1K6/2N1BN2/2B4p/P4P1k/3Q4 w - - 0 1"]

With Promoted Pieces: 211 Stalemating Moves, ID# P1178842, Created By William Cross, Anthony Stewart, & Mackay Dickens, Published In FEENSCHACH, Date 01/1969

[FEN "4Q2R/1K4Q1/3Q4/Q4Q2/2Q4Q/4Q3/1Q4Rp/1N1BB1Nk w - - 0 1"]

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